First let me say if you are using terms like "first pressing" then you've really got some catching up to do on your essential oil education. Most all essential oils are steam distilled, in fact this is inherent to the very definition of an essential oil. The only oils that are considered to fall under the definition of the term "essential oil" and are not produced by steam distillation are the citrus oils, which are cold pressed from the citrus peel (and if its done properly there would not be any oil left in the peel for a second pressing LOL). So when one refers to the so called "first pressed" essential oils they does not even portray an accurate method of production of almost every essential oil out there, since almost every oil is produced by distillation, not by pressing. Please avoid this "pressing" terminology unless you want to just sound like a complete novice to the field. When the pressed method is applicable, in the industry we use the terms COLD PRESSED or EXPRESSED to describe the production of citrus oils (some citrus are also distilled but that’s another issue). So this brings us to the whole issue of the claimed "multiple distillations" of the same plant material. Consider this quote from a popular blog:
"Peppermint is an interesting plant in that it yields more oil than most others. As such, large farms and distilleries extract a bunch of oil from the peppermint plant. Smaller farms do a first distillation of peppermint that they sell to oils companies for the highest price. The peppermint is then re-distilled at a higher pressure and higher temperature for a 2nd distill, and the resulting oil is sold for less money to soap companies, and the like, that want a lower cost oil, but still desire a slightly “herby” smell. The plant is then re-distilled one more time at a yet higher temperature and pressure for a 3rd distill, which is sold to companies wanting the candy-cane smelling oil."
I hate to be harsh here but what an utter load of pure NONSENSE!!! First let me say that I live in Indiana, one of the largest mint producing states in the country. I have visited mint distilleries and farms on several occasions (you can see some photos of one of my visits in the album entitled "Mint Farm in Northern Indiana"). NOBODY STEAM DISTILLS THE SAME MINT LEAVES MORE THAN ONE TIME!! The plant is distilled for basically 2 hours and its done, no more oil is coming out so they shut the still down. Its absolutely ridiculous to think that the distiller, after watching his oil come over, seeing that his oil level is not growing, shuts the still down and then later thinks to himself “gee, I bet if I fire this still back up (wasting thousands in feul and labor) we can get some more oil out of that spent mint leaf we distilled yesterday.” Where do people come up with this stuff!!?? Now the MINT OIL can, and often is (thank God), taken for some further redistilling and/or fractional vacuum redistilling that can take place to further improve the quality of the oil by removing nauseating components of the whole oil (just tiny amounts of very bad smelling components get removed in this process). But NOBODY distills the mint biomass a second or third time. This is generally true, not just for mint, but for essential oil distillations in general. When I tried to explain it to the person posting this rubbish she basically did not believe me because her “research” of talking to retailers of essential oils apparently was of higher credibility. If people would just use some common sense they could look at this kind of misinformation and come to the conclusion that none of it makes sense. From an energy standpoint, why would anyone plan to shut down their distilling process just to start it up again later? The amount of energy required to get massive amounts of water boiling and enough steam generating to liberate the oil from large vats of biomass is quite astonishing and costly. Why not just keep distilling and just start collecting the oil produced at the tail end of the distillation in a separate container, if you want to collect what you think might be a different quality at the end of the run than at the beginning (by the way this is done with Ylang Ylang oil which is why there are the different grades of extra, I, II, III and complete). But aside from ylang ylang most all essential oil distillations are collected in one combined lot. And the only time I have ever seen a distiller shut down his process and restart it later was because of mechanical problems, running out of fuel, or just getting too physically tired to continue (in the case of sandalwood for example the distillation can go on for more than 24 hours and oil is still in the wood). I hope that this post will finally do some damage to this myth that has been circulated for decades now and we can finally put it to bed. Please share this post with as many people as you can and firmly admonish anyone who continues to state that “my oils only come from the FIRST distillation.” Yeah right buddy, just like everybody else’s oil. LOL